Tern Vektron S10 Folding Electric Bike
Upgraded to the Bosch Performance electric drivetrain for 300% more assistance and 65 Nm of torque, the Tern Vektron S10 folding e-bike is built to handle long, hilly commutes in rain, snow or shine.
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- Bosch Performance motor with Purion display delivers pedal assist up to 20 mph, helping you carry groceries and tackle steep hills without the sweat
- Purion onboard computer lets you switch between 5 different riding modes and displays handy info like speed, battery level and distance
- Shimano Deore Shadow+ rear derailleur is streamlined and resilient to avoid damage while transporting the folded bike; clutch adjusts chain tension to avoid drops while riding
- Go farther with the Bosch PowerPack 400 battery—it offers a range of up to 68 mi., depending on conditions and assist settings; battery weighs just 5.5 lbs.
- Magura MT4 hydraulic disc brakes give you excellent stopping power in rain, snow or mud with the gentle pull of just 2 fingers
- Androsâ„¢ patented adjustable stem lets you set your handlebar where you want in just seconds without tools; you can set your riding position to upright or long and low
- Heavy-duty OCL+â„¢ frame joint is built to exceed ISO 4210 and EN 15194 testing requirements; it stays stiff and strong during even the fastest commutes
- Integrated Atlas V rack works seamlessly with one Thule Yepp Maxi or Yepp Nexxt Maxi child seat (not included)—no adapters needed; max load capacity is 59 lbs.
- Porter+ saddle has a dual-density construction with gel cushioning to keep you comfortable while riding
- GripPadâ„¢ underneath the saddle lets you grip the saddle nose confidently when you're rolling your bike around or put it on your shoulder to carry the bike
- 360° of active lighting and 360° of reflectivity help you be seen from all angles when it's dark out
- Bike resizes in seconds to fit riders from 4 ft. 10 in. to 6 ft. 5 in. (150–195 cm) so a single bike can be shared by the family
- Easily fits on buses, subways and taxis for multimodal commuting
- NOTE: Specs and images are subject to change based on component availability
Imported.
- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- An additional year of free adjustments on e-bikes
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
UL2849 certified
| Best Use | Urban Cycling |
|---|---|
| E-Bike Classification | Class 1: pedal assist up to 20 mph |
| Motor | Bosch Performance |
| Motor Type | Mid-Drive |
| Motor Torque (Nm) | 65 Newton meters |
| Battery Type | Lithium Ion |
| Battery Capacity (Wh) | 400 watt hours |
| Battery Removable | Yes |
| Charge Time (hrs) | 2.5-4 hours |
| Pedal Assist Range | 34-68 miles |
| Frame | 7005-AL, OCL+ Joint |
| Foldable | Yes |
| Step-Through | No |
| Bike Suspension | No Suspension |
| Fork | Hydroformed 6061 aluminum |
| Crankset | 6061 aluminum crankarms |
| Bottom Bracket | Motor Integrated |
| Shifters | Shimano Deore |
| Rear Derailleur | Shimano Deore Shadow+ |
| Rear Cogs | Shimano 10-speed, 11-36T |
| Number of Gears | 10 gear(s) |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Magura MT4 hydraulic disc |
| Brake Levers | Magura hydraulic disc |
| Rims | Kinetix Comp for disc |
| Front Hub | Novatec, sealed cartridge bearing, disc |
| Rear Hub | Novatec, sealed cartridge bearing, disc |
| Wheel Size | 20 inches |
| Tires | Schwalbe Big Apple 20 x 2.15 in. (55-406), puncture protection, Reflex |
| Tire Width | 2.15 inches |
| Handlebar Shape | Flat Bar |
| Handlebar | Tern Andros adapted 6061 aluminum |
| Stem | Tern Andros, adjustable |
| Seat Post | Tern Telescope, 34.9/30.9 mm, 2014 aluminum |
| Saddle | Tern Porter+ |
| Pedals | MKS EZY |
| Headset | Flux Pro, angular contact bearings, Physis integrated |
| Chain | 10-speed DHT for e-bike with GST corrosion-resistant coating |
| Weight | 48 lbs. 9.6 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Unisex |
| Sustainability | Contains recycled materials |
| One Size | |
|---|---|
| Height Range | 4'10''-6'5'' |
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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Love this bike
I bought this bike in 2020 from REI. It has totally changed how I commute to work or appointments, and I love riding it--especially up those steep hills that I would avoid on a regular bike. It's also so nice not to have to worry about charging the lights separately from the bike, and the battery lasts a long time. The computer is also very easy to use and read, and the bike feels remarkably stable, even going over bumps and cracks. It is a little clunkier than it looks in the videos, but you really can fold it up and move it around, eg to an office. That feature gives me peace of mind that I can take it to appointments or events where I wouldn't feel comfortable locking it up outside. I am so glad I bought it, and I recommend it to anyone who is looking for a folding e-bike.
I love this bike
It’s so functional and it so well designed. If I had to be ultra picky, I have the Tern bucketload pannier which I leave on the bike all the time (it doesn’t interfere with folding) and when it’s filled with a lot of stuff the single sided Vektron kickstand doesn’t support the bike any longer it can tip over toward the loaded pannier side unless you hold the bike or place it against something for support. But like I said, 5 stars. Highly recommended.
Unbeatable versatility and performance
After logging over 700 miles in just a year with my Tern Vektron S10, I’m thoroughly impressed and feel compelled to give it a five-star review. This bike has been a game-changer for my daily commute and running errands, effectively replacing our car for most trips around town. One of the standout features of the Vektron S10 is its ability to handle a variety of tasks and weather conditions. It comfortably pulls my 4-year-old along, and with the addition of poggies, it manages ice and snow with ease, making it a reliable companion throughout the seasons. Despite being a folding bike, it rides with the stability and comfort of a traditional bike, which is a significant plus. It’s also lightweight for its class at 50 pounds and comes equipped with premium components that ensure durability and a smooth ride. Tern remains my favorite e-bike brand, and the Vektron S10 is a testament to their quality and innovation. I highly recommend it to anyone looking for a dependable and versatile e-bike. It’s a solid investment, and I’m excited to add more from Tern’s lineup to our family bike collection in the future. Feel free to tweak this review to better match your personal voice or add any additional details you think might help other potential buyers!
Perfect Cruising Companion
You get what you pay for! My partner and I both have Vektrons. We take them on our boat, in the Tern travel bags, and they are the perfect solution. We have traveled many islands of the Salish Sea and have been quite happy. They ride like a standard bike. No "folding bike disadvantages" on the road for this bike! And the infinite adjustments work for 5'7" me, and my 6'3" brother-in-law. I have a cargo trailer that I add for bigger loads when needed. It makes a perfect grocery-getter.
Solid Construction, Solid Feel
I have only had my Vectron S10 for a very short time. I think I’ve put 28 miles on it so far. That said, the bike rides great with and without power assistance. It feels solid on the road. I’ve not tested it on gravel or rough roads so it’s too early to know how it will handle.
poor build quality and attention to detail
lots of cheap plastic. had to remove the chain guard so it doesn't break. Rubber hinge cover won't stay in place. lights seem fragile. clip to keep pedal while folded is no longer included in the build. supposedly the new model folds better and doesn't need the clip. But the pedal still has to be removed to lay the bike in the trunk. hopefully it doesn't get lost. new model also states that it no longer needs the bungee to keep it closed. but the magnet to keep the bike folded doesn't align very well so the bike still has to be bungeed. for the price of this bike I would expect better quality. I will be returning it. it is too bad too because otherwise this is a great bike.
A "folding BICYCLE", not a "FOLDING bicycle"
Folding bicycles are all about compromise, so the question is how to pick the folding bike that has the compromises you want. The Vektron is a great bicycle first, and a folding bike second. It has 20-inch wheels, so it won't be the smallest folder. It will fit in a trunk or a backseat, but it will take up all the space. You can transport one in a typical car trunk without using a bike rack, if that matters to you. The tires are big enough that handling won't be twitchy. The mid-drive motor uses your gears and it will climb hills easily, even when they're more than a 15% grade. The rack at the back holds a lot of weight, and although the rails are thick, they're still compatible with Ortlieb panniers. Being a great bike first comes at a cost. The Vektron is pretty heavy, so you'll really want an elevator to move between floors. Sure, you can take it on transit and roll it on to a train, but if the train doesn't have a level platform to just roll off, it's going to be a lift to get it up even a step or two. There's a magnet on the front wheel that supposedly keeps the bike folded well, but they bundle a bungee cord to hold the folded bike together. I considered this bike and the Brompton Electric. I bought the Vektron because my commute is fully by bicycle (so the rack was important but the elegance of fold for transport by trains was not), and the mid-drive system helps climb hills.
Not as practical as it seems
I found this bike to not be very practical. It’s somewhat of a cargo bike, but also folding. The thing is, you can’t really expect to use both. If you want to fold it, you first have to remove any cargo accessories. This is obvious in hindsight, but easily overlooked when shopping. Folding is not as easy as described, but becomes so much more annoying when having to remove accessories too. For me it was the Yepp child seat, weigh is easy to install and remove but feels like a big barrier on top of folding. The weight of the bike also feels awkward. I returned this for a GSD, which is significantly heavier but somehow easier to manage. Overall would not recommend, but I gave it a 3 because it does feel like a quality and fun bike to ride. If you go into it with the above in mind you could be ok, I just think it’s quite a bit over marketed as so easy and flexible.
Tern Vektron S10 folding electric bike is a marvel
The build and ride are amazing! The Sacramento REI bicycle mechanics were incredibly knowledgeable about the bike, answered the myriad of questions I had and allowed me to compare and contrast this e-bike with others available at the store (lots of test rides... thanks for your patience). I ordered 2 of these e-bikes (his and hers to celebrate a 25th (silver) marriage anniversary - silver e-bikes, of course). When I picked up the e-bikes, the REI bike mechanic showed me how to fold the e-bike until I was able to do it myself. The bike mechanic also helped me load both folded e-bikes in the back of a VW Golf hatchback (unbelievable or not, it happened). The mechanic was gracious in reminding me that if there were any issues, I could bring the e-bikes back until I was satisfied. Needless to say, with this kind of customer service and e-bike, I am over the moon and enjoying the cycling adventures with my spouse. THANK YOU REI!!!